Open to freelance and professional work

Reyga Elang Fariz Virgiawan

I'm a Technical Lead with 7+ years of experience as a software engineer. For about the last 3 of those years I have led a team while still writing code myself. I currently work at a B2B fintech company in Jakarta, where my team builds payment systems. I also founded dagangyuk.id, a point-of-sale app now used by more than 50 small businesses, so I'm used to weighing technical quality against what the business needs. Outside my main job I take freelance projects: web apps, mobile apps, CMS/CRM and backend systems.

Portrait of Reyga Elang Fariz Virgiawan
  • 7+ yearsSoftware engineer · 3 as a lead
  • Jakarta, IndonesiaBased in · works remotely
  • Fintech & payment gatewaysMain field
  • Secure Coding, 2023Cyber Academy Indonesia

Right now

What I do now

Day job · Present

Technical Lead, Software Engineer

B2B fintech company · Jakarta

I lead an engineering squad that builds payment features for business customers. I set the technical direction, review designs and code, and still write code myself. Most of the work involves transactions and payment gateway integrations. I have also been involved in PCI DSS audit work for credit card payments.

  • Technical leadership
  • Payment gateways
  • PCI DSS
  • System design
  • Secure coding

Own product · Present

Founder

dagangyuk.id · POS for UMKM

I built dagangyuk.id myself: the Android app, the backend and the QRIS payments. Today it serves more than 50 UMKM merchants. I also handle pricing and customer support, so I know what it is like to run a product on a small budget, not only to code one.

  • Product
  • Android
  • Backend
  • QRIS payments

Tech stackGo · Java · Node.js · React · Angular · Flutter · MySQL · PostgreSQL · Oracle · Redis · MongoDB

Side project

A cashier app I built for small shops

dagangyuk.id“Kasir Rapi, Stok Terkontrol, Omzet Naik”

dagangyuk.id is an Android point-of-sale app for small and medium businesses in Indonesia: retail shops, warungs, restaurants and stores with several branches. It is live on Google Play with 100+ downloads, and more than 50 merchants use it. Plans start at Rp49.000 per month.

What it does

  • Android cashier with receipt printing
  • Real-time stock tracking and alerts
  • QRIS digital payments
  • Online ordering by QR code
  • Live sales reports
  • Multi-outlet and staff access

Freelance

What I can help with

You work with me directly, from the first call to delivery. Before starting I send a written scope and estimate, then deliver in stages so you can check progress early.

Web apps & dashboards WEB

Custom web applications, admin panels and internal tools, built with React or Angular on a Go or Node.js backend. A common case is replacing spreadsheets that the business has outgrown.

CMS & CRM systems CMS · CRM

Company websites with a CMS, so your team can update content without a developer. Custom CRM to keep track of leads, customers and follow-ups, or setup and integration of an existing platform if that fits better.

Mobile apps ANDROID · IOS

Android and iOS apps built with Flutter, from prototype to release on the store. I went through the same process with dagangyuk.id.

Backend & API systems API

APIs, third-party integrations and payment flows, including payment gateways, QRIS and invoicing.

Code rescue & stack migration RESCUE · MIGRATION

Taking over a codebase built quickly with AI tools or by a previous developer and getting it ready for real users: fixing bugs, closing security holes, adding tests and cleaning up the structure. Also moving an app from one stack to another, for example from a no-code or prototype setup to Go, Node.js, React or Flutter.

Tech consulting ADVISORY

Architecture reviews, MVP planning and a second opinion for startups and small businesses before they commit budget to a build.

Freelance FAQ

Questions about freelance work

What kind of freelance projects do you take?

Custom web applications and dashboards, websites with a CMS, CRM systems, Android and iOS apps, backend and API work, and payment integrations such as payment gateways and QRIS. I also take over existing codebases to fix or migrate them, and do architecture reviews and MVP planning.

Can you build a CMS or CRM for my business?

Yes. For content-heavy sites I set up a CMS so your team can publish without touching code. For sales and customer data I build a custom CRM or integrate an existing one, depending on your process and budget.

My app was built with AI tools (Cursor, Lovable, Bolt) and I need it production-ready. Can you help?

Yes, this is common now. I start with a short review of the code and infrastructure, then send a list of what must be fixed before launch, what can wait, and what it would cost. From there I can fix it, rebuild parts of it, or migrate it to a stack your team can maintain.

Can you integrate a payment gateway or QRIS into my product?

Yes. Payments are what I work on every day at a B2B fintech company, and I built QRIS payments into dagangyuk.id. I have also been involved in PCI DSS audit work, so I am used to card data security requirements. I can add a payment gateway to your web or mobile app, or review an integration you already have.

Do you work with clients outside Jakarta?

Yes. I live in Jakarta and work remotely with clients across Indonesia and abroad. We can talk over WhatsApp, email or video call, in Indonesian or English.

How does pricing work?

It depends on the scope. After a short talk about what you need, I send a written estimate with scope, timeline and cost before any work starts.

How do we get started?

Send me a WhatsApp message or an email with a short description of what you want to build and when you need it. For full-time or professional roles, please use LinkedIn.

Have a project, or a role in mind?

Freelance & side projects

Need a web app, mobile app, CMS, CRM or backend work? Send me a WhatsApp message or an email with a short description of what you need.

Hiring & professional roles

Hiring for a technical lead or senior engineering role? Please reach me on LinkedIn. My full work history is there.